₦airaland Forum

I have been using www.kullsms.com since 2005 ( over 10 years). They are very reliable but not the cheapest, good things don't come cheap anyway.

Visit www.kullsms.com, api is download-able from their downlaod page free, all u need is to activate an account with them.
here is their api link
http://www.kullmessage.com/downloads/kullhttpapi.doc
you can test with their demo account
username: kulldemo
password: demo
you will surely enjoy their service, have been with them for over 4years now.
take care